Answer: An object falling vertically through the air is subjected to viscous resistance

Chapter 2, Problem 23

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An object falling vertically through the air is subjected to viscous resistance as well as to the force of gravity. Assume that an object with mass m is dropped from a height s0 and that the height of the object after t seconds is s(t) = s0 mg k t + m2g k2 (1 ekt/m), where g = 32.17 ft/s2 and k represents the coefficient of air resistance in lb-s/ft. Suppose s0 = 300 ft, m = 0.25 lb, and k = 0.1 lb-s/ft. Find, to within 0.01 s, the time it takes this quarter-pounder to hit the ground.

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